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I am no expert, but I would think the video would contain more activity when the car was moving, compared to when it was parked. The task would then be to measure the activity, and determine how much activity constitutes car movement. One measure of activity of a video, is to calculate the absolute difference between the last and current frame (differencing), and take the sum of the resulting image. In this manner, one could calculate the activity for each pair of frames, and if this value exceeded some threshold, one could conclude that the car was moving.